linux system does have any password and wanted to connect that system through another but it is not connecting says permission denied.
So suggest me some solution for this problem

you gave no usable information about your problem, so hard to say anything. Probably you mistyped your username/password/hostname/port, probably something misconfigured.
See http://catb.org/~esr/faqs/smart-ques...html#beprecise

Hi Bloodaxe,

Welcome to LQ!

If you're trying to log in as root, but root log-in is disabled, you might get that error.

thank for helping me pan64 and AwesomeMachine, my problem is that
I want to connect to a system(first system) remotely using ssh remote host from another system and I also know the IP address of that system(first system) which has to be connected. For the first system (which I wanted to connect) has no user password to log in.
While connecting to the first system I have typed in the terminal "ssh student@172.16.9.188" and it asked for the password, when I click enter it says permission denied since there is no user password for the first system which I wanted to connect

Is it set up to use private/public keypair to login instead? If so you need to tell ssh where the private key that matches the public key (authorized_keys usually) on the target system is. IE

Am I grasping this correctly? You want simply want to log into another system using passwordless ssh? OR you want to log into another system using passwordless ssh, and from that system run ssh into a third system that requires login credentials for ssh?